Question Title: Unable to Load a .NET UserControl In Web Browser

From: AmiciDan (AmiciDan_at_discussions.microsoft.com)
Date: 02/17/05 

Date: Wed, 16 Feb 2005 16:31:03 -0800

I can't get a simple usercontrol to load up in a web page. Below is the
description of what I'm doing i full details. I know this *should* work
because I have built other usercontrols on the same system that *do* load up
just fine. The primary difference is these other usercontrols use additional
assemblies from an SDK. However, a *basic* usercontrol just won't load.
What am I doing wrong? It must be something simple I'm missing:

I've written a very simple *test* usercontrol in VC .NET 2003 as a "windows
control library".

Here're the basic steps broken out:

1. Create a new C# Project as a "windows control library".
1 a. All I did was create the basic project, resize the form to make it
bigger, and add a Button control on it. I didn't even program the Button. I
just placed it on the form.
2. Compile it and get "testcontrol.dll" (I named the project testcontrol so
I get testcontrol.dll out).
3. Copy "testcontrol.dll" over to a web server virtual directory.
4. Create an HTML file and have the following line in the<body> element:
<object id="testcontrol"
classid="http://localhost/testcontrol.dlll#testcontrol.TestControl">
</object>
where testcontrol is the namespace and TestControl is the name of the class
as in the .cs file:

namespace testcontrol
{
     /// <summary>
     /// Summary description for UserControl1.
     /// </summary>
     public class TestControl : System.Windows.Forms.UserControl

5. Run the MMC snap-in for .NET Configuration Management:

C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorcfg.msc (your location may
be slightly different per the version of the Framework installed).

5 a. Since my Apache server is running locally and I access the web site at
http://localhost/testcontrol.html, I'll do the following:

In the MMC snap-in, click on
My Computer
  |
  Runtime Security Policy
     |
     Machine
       |
       Code Groups
          |
          All Code
            |
            LocalIntranet_Zone

5 b. Right-Click on LocalIntranet_Zone and choose, New.
In "Create a new code group" under Name: type in the machine_name.
Click Next
In the "Choose the condition type for this code group:" select URL
In the URL text box type: "http://localhost/*"
Click Next
In the "Use existing permission set:" select FullTrust
Click Next, and Finished.

Without doing step 5. you won't have trusted access to the assembly you built.

6. Now, ideally all should work at this point. Simply open the web page
http://localhost/testcontrol.html. Here is my HTML file:

<html>
<head><title>Dan's Most Excellent TestControl Demo</title></head>
<body>
<center><h1>Dan's Most Excellent TestControl Demo</h1></center></br>
<hr></hr>
<object id="testcontrol" align="middle" border="1"
classid="http://localhost/testcontrol.dlll#testcontrol.TestControl">
</object>
</body></html>

and I've copied testcontrol.dll over to the web server's /htdocs location
which is also where testcontrol.html is.

However, the control does NOT LOAD. I can't seem to figure out what I'm
doing wrong. Now, I did to the following:

7. Create a Strong Name by running:
"C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\Bin\sn.exe" -k
testcontrol.snk

7 a. Copy testcontrol.snk to a directory in my build environment (where the
.CS file is) and add the location ("..\\..\\testcontro.snk") in assembly.cs
in the
AssemblyKeyFile() location.

7 b. Build a new testcontrol.dll with the strong name and copy it to the
web server directory.

regasm and gacutil it:

C:\Program Files\Apache
Group\Apache\htdocs>C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\regasm /tlb
"C:\Program Files\A
pache Group\Apache\htdocs\testcontrol.dll"
Microsoft (R) .NET Framework Assembly Registration Utility 1.1.4322.573
Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.

Types registered successfully
Assembly exported to 'C:\Program Files\Apache
Group\Apache\htdocs\testcontrol.tlb', and the type library was registered
successfully

C:\Program Files\Apache
Group\Apache\htdocs>C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\gacutil /i
"C:\Program Files\Ap
ache Group\Apache\htdocs\testcontrol.dll"

Microsoft (R) .NET Global Assembly Cache Utility. Version 1.1.4318.0
Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.

Assembly successfully added to the cache

8. Run IE as such: http://localhost/testcontrol.html. The control does
NOT load. I can even run this in WinDBG the windows debugger and see that
the control does NOT load into memory. I don't get any error messages. I
know I must be doing something simple that's incorrect. I need help please!

9. I did all the same similar steps above with a usercontrol I created
using the AtalaSoft .NET DotImage and DotAnnotate SDKs in a much more complex
C# program and it *works*. When I run my UserControl created with the
AtalaSoft SDK via the HTML file I created under a debugger I can see:

ModLoad: 79170000 79196000 C:\WINDOWS\system32\mscoree.dll
ModLoad: 79410000 79425000
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorie.dll
ModLoad: 7c340000 7c396000
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\MSVCR71.dll
ModLoad: 79480000 79499000
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorld.dll
ModLoad: 794f0000 79504000
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorsec.dll
ModLoad: 74e30000 74e9c000 C:\WINDOWS\system32\RichEd20.dll
ModLoad: 732d0000 732d5000 C:\WINDOWS\system32\SOFTPUB.DLL
ModLoad: 0ffd0000 0fff8000 C:\WINDOWS\system32\rsaenh.dll
ModLoad: 03a30000 03c96000
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorwks.dll
ModLoad: 79040000 79085000
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\fusion.dll
ModLoad: 79780000 7998c000
c:\windows\microsoft.net\framework\v1.1.4322\mscorlib.dll
ModLoad: 79990000 79ccc000
c:\windows\assembly\nativeimages1_v1.1.4322\mscorlib\1.0.5000.0__b77a5c561934e089_7e62dfdc\mscorlib.dll
ModLoad: 79090000 7909c000
c:\windows\assembly\gac\iehost\1.0.5000.0__b03f5f7f11d50a3a\iehost.dll
ModLoad: 790b0000 790b8000
c:\windows\assembly\gac\iiehost\1.0.5000.0__b03f5f7f11d50a3a\iiehost.dll
ModLoad: 79430000 7947d000
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\MSCORJIT.DLL
ModLoad: 7b490000 7b506000
c:\windows\assembly\gac\system.drawing\1.0.5000.0__b03f5f7f11d50a3a\system.drawing.dll
ModLoad: 7b510000 7b5de000
c:\windows\assembly\nativeimages1_v1.1.4322\system.drawing\1.0.5000.0__b03f5f7f11d50a3a_56ef66e7\system.drawing.dll
ModLoad: 7b0a0000 7b1ce000
c:\windows\assembly\gac\system\1.0.5000.0__b77a5c561934e089\system.dll
ModLoad: 7b1d0000 7b3b0000
c:\windows\assembly\nativeimages1_v1.1.4322\system\1.0.5000.0__b77a5c561934e089_9177a4ba\system.dll
ModLoad: 71b20000 71b32000 C:\WINDOWS\system32\MPR.dll
ModLoad: 11000000 1100e000 c:\documents and
settings\dwerken.productivitynet\local settings\application
data\assembly\dl2\q9hy0rwj.pax\7tek58oz.hhc\b8ff1e30\005dd2dc_4514c501\wwwtiffdemo.dl

where wwwtiffdemo.dll is my .NET Assembly. I don't get this with my much,
much simpler test control.

The reason I'm doing this is I'm trying to actually use the WebBrowser
control and SHDocVW to host Office documents in a .NET Assembly UserControl
in a web page, but there is another issue with Strong Names that I'll ask
later. I want to simply solve my very simple issue here first.

Thanks,

---Dan---

Relevant Pages

  • Re: Dynamically Loading a UserControl
    ... only one user control is being rendered. ... SelectedIndexChanged event do a Server.Transfer and apend a QueryString to ... Requestquery string to know which control to load. ... > keeping track of what UserControl to load upon a page being posted back. ...
    (microsoft.public.dotnet.framework.aspnet)
  • Re: Dynamically Loading a UserControl
    ... > only load the control named in the ViewState if the PostBack was NOT ... >> keeping track of what UserControl to load upon a page being posted back. ...
    (microsoft.public.dotnet.framework.aspnet)
  • RE: Question Title: Unable to Load a .NET UserControl In Web Browser
    ... and add a Button control on it. ... the control does NOT LOAD. ... > AssemblyKeyFile() location. ... > control and SHDocVW to host Office documents in a .NET Assembly UserControl ...
    (microsoft.public.dotnet.framework.windowsforms.controls)
  • Re: Ajax TabContainer behaviour like Windows TabControl?
    ... Database while Page load. ... There is a TabContainer control below the Menu Control. ... Now i want to add corresponding UserControl dynamically when user clicks on ...
    (microsoft.public.dotnet.framework.aspnet)
  • Re: Required multiple instances of a UserControl loaded at runtime
    ... the user control when a button onclick event fires and also in a Placeholder ... Load event in the right conditions. ... some certain place so that the usercontrol can access it later. ...
    (microsoft.public.dotnet.framework.aspnet.webcontrols)